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iText, a free Java-PDF library
/*
* $Id: PdfPageLabels.java 5231 2012-07-11 08:36:56Z achingarev $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2012 1T3XT BVBA
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
* 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashMap;
import com.itextpdf.text.ExceptionConverter;
import com.itextpdf.text.error_messages.MessageLocalization;
import com.itextpdf.text.factories.RomanAlphabetFactory;
import com.itextpdf.text.factories.RomanNumberFactory;
/** Page labels are used to identify each
* page visually on the screen or in print.
* @author Paulo Soares
*/
public class PdfPageLabels {
/** Logical pages will have the form 1,2,3,...
*/
public static final int DECIMAL_ARABIC_NUMERALS = 0;
/** Logical pages will have the form I,II,III,IV,...
*/
public static final int UPPERCASE_ROMAN_NUMERALS = 1;
/** Logical pages will have the form i,ii,iii,iv,...
*/
public static final int LOWERCASE_ROMAN_NUMERALS = 2;
/** Logical pages will have the form of uppercase letters
* (A to Z for the first 26 pages, AA to ZZ for the next 26, and so on)
*/
public static final int UPPERCASE_LETTERS = 3;
/** Logical pages will have the form of uppercase letters
* (a to z for the first 26 pages, aa to zz for the next 26, and so on)
*/
public static final int LOWERCASE_LETTERS = 4;
/** No logical page numbers are generated but fixed text may
* still exist
*/
public static final int EMPTY = 5;
/** Dictionary values to set the logical page styles
*/
static PdfName numberingStyle[] = new PdfName[]{PdfName.D, PdfName.R,
new PdfName("r"), PdfName.A, new PdfName("a")};
/** The sequence of logical pages. Will contain at least a value for page 1
*/
private HashMap map;
/** Creates a new PdfPageLabel with a default logical page 1
*/
public PdfPageLabels() {
map = new HashMap();
addPageLabel(1, DECIMAL_ARABIC_NUMERALS, null, 1);
}
/** Adds or replaces a page label.
* @param page the real page to start the numbering. First page is 1
* @param numberStyle the numbering style such as LOWERCASE_ROMAN_NUMERALS
* @param text the text to prefix the number. Can be null or empty
* @param firstPage the first logical page number
*/
public void addPageLabel(int page, int numberStyle, String text, int firstPage) {
if (page < 1 || firstPage < 1)
throw new IllegalArgumentException(MessageLocalization.getComposedMessage("in.a.page.label.the.page.numbers.must.be.greater.or.equal.to.1"));
PdfDictionary dic = new PdfDictionary();
if (numberStyle >= 0 && numberStyle < numberingStyle.length)
dic.put(PdfName.S, numberingStyle[numberStyle]);
if (text != null)
dic.put(PdfName.P, new PdfString(text, PdfObject.TEXT_UNICODE));
if (firstPage != 1)
dic.put(PdfName.ST, new PdfNumber(firstPage));
map.put(Integer.valueOf(page - 1), dic);
}
/** Adds or replaces a page label. The first logical page has the default
* of 1.
* @param page the real page to start the numbering. First page is 1
* @param numberStyle the numbering style such as LOWERCASE_ROMAN_NUMERALS
* @param text the text to prefix the number. Can be null or empty
*/
public void addPageLabel(int page, int numberStyle, String text) {
addPageLabel(page, numberStyle, text, 1);
}
/** Adds or replaces a page label. There is no text prefix and the first
* logical page has the default of 1.
* @param page the real page to start the numbering. First page is 1
* @param numberStyle the numbering style such as LOWERCASE_ROMAN_NUMERALS
*/
public void addPageLabel(int page, int numberStyle) {
addPageLabel(page, numberStyle, null, 1);
}
/** Adds or replaces a page label.
*/
public void addPageLabel(PdfPageLabelFormat format) {
addPageLabel(format.physicalPage, format.numberStyle, format.prefix, format.logicalPage);
}
/** Removes a page label. The first page label can not be removed, only changed.
* @param page the real page to remove
*/
public void removePageLabel(int page) {
if (page <= 1)
return;
map.remove(Integer.valueOf(page - 1));
}
/** Gets the page label dictionary to insert into the document.
* @return the page label dictionary
*/
public PdfDictionary getDictionary(PdfWriter writer) {
try {
return PdfNumberTree.writeTree(map, writer);
}
catch (IOException e) {
throw new ExceptionConverter(e);
}
}
/**
* Retrieves the page labels from a PDF as an array of String objects.
* @param reader a PdfReader object that has the page labels you want to retrieve
* @return a String array or null if no page labels are present
*/
public static String[] getPageLabels(PdfReader reader) {
int n = reader.getNumberOfPages();
PdfDictionary dict = reader.getCatalog();
PdfDictionary labels = (PdfDictionary)PdfReader.getPdfObjectRelease(dict.get(PdfName.PAGELABELS));
if (labels == null)
return null;
String[] labelstrings = new String[n];
HashMap numberTree = PdfNumberTree.readTree(labels);
int pagecount = 1;
Integer current;
String prefix = "";
char type = 'D';
for (int i = 0; i < n; i++) {
current = Integer.valueOf(i);
if (numberTree.containsKey(current)) {
PdfDictionary d = (PdfDictionary)PdfReader.getPdfObjectRelease(numberTree.get(current));
if (d.contains(PdfName.ST)) {
pagecount = ((PdfNumber)d.get(PdfName.ST)).intValue();
}
else {
pagecount = 1;
}
if (d.contains(PdfName.P)) {
prefix = ((PdfString)d.get(PdfName.P)).toUnicodeString();
}
if (d.contains(PdfName.S)) {
type = ((PdfName)d.get(PdfName.S)).toString().charAt(1);
}
else {
type = 'e';
}
}
switch(type) {
default:
labelstrings[i] = prefix + pagecount;
break;
case 'R':
labelstrings[i] = prefix + RomanNumberFactory.getUpperCaseString(pagecount);
break;
case 'r':
labelstrings[i] = prefix + RomanNumberFactory.getLowerCaseString(pagecount);
break;
case 'A':
labelstrings[i] = prefix + RomanAlphabetFactory.getUpperCaseString(pagecount);
break;
case 'a':
labelstrings[i] = prefix + RomanAlphabetFactory.getLowerCaseString(pagecount);
break;
case 'e':
labelstrings[i] = prefix;
break;
}
pagecount++;
}
return labelstrings;
}
/**
* Retrieves the page labels from a PDF as an array of {@link PdfPageLabelFormat} objects.
* @param reader a PdfReader object that has the page labels you want to retrieve
* @return a PdfPageLabelEntry array, containing an entry for each format change
* or null if no page labels are present
*/
public static PdfPageLabelFormat[] getPageLabelFormats(PdfReader reader) {
PdfDictionary dict = reader.getCatalog();
PdfDictionary labels = (PdfDictionary)PdfReader.getPdfObjectRelease(dict.get(PdfName.PAGELABELS));
if (labels == null)
return null;
HashMap numberTree = PdfNumberTree.readTree(labels);
Integer numbers[] = new Integer[numberTree.size()];
numbers = numberTree.keySet().toArray(numbers);
Arrays.sort(numbers);
PdfPageLabelFormat[] formats = new PdfPageLabelFormat[numberTree.size()];
String prefix;
int numberStyle;
int pagecount;
for (int k = 0; k < numbers.length; ++k) {
Integer key = numbers[k];
PdfDictionary d = (PdfDictionary)PdfReader.getPdfObjectRelease(numberTree.get(key));
if (d.contains(PdfName.ST)) {
pagecount = ((PdfNumber)d.get(PdfName.ST)).intValue();
} else {
pagecount = 1;
}
if (d.contains(PdfName.P)) {
prefix = ((PdfString)d.get(PdfName.P)).toUnicodeString();
} else {
prefix = "";
}
if (d.contains(PdfName.S)) {
char type = ((PdfName)d.get(PdfName.S)).toString().charAt(1);
switch(type) {
case 'R': numberStyle = UPPERCASE_ROMAN_NUMERALS; break;
case 'r': numberStyle = LOWERCASE_ROMAN_NUMERALS; break;
case 'A': numberStyle = UPPERCASE_LETTERS; break;
case 'a': numberStyle = LOWERCASE_LETTERS; break;
default: numberStyle = DECIMAL_ARABIC_NUMERALS; break;
}
} else {
numberStyle = EMPTY;
}
formats[k] = new PdfPageLabelFormat(key.intValue()+1, numberStyle, prefix, pagecount);
}
return formats;
}
public static class PdfPageLabelFormat {
public int physicalPage;
public int numberStyle;
public String prefix;
public int logicalPage;
/** Creates a page label format.
* @param physicalPage the real page to start the numbering. First page is 1
* @param numberStyle the numbering style such as LOWERCASE_ROMAN_NUMERALS
* @param prefix the text to prefix the number. Can be null or empty
* @param logicalPage the first logical page number
*/
public PdfPageLabelFormat(int physicalPage, int numberStyle, String prefix, int logicalPage) {
this.physicalPage = physicalPage;
this.numberStyle = numberStyle;
this.prefix = prefix;
this.logicalPage = logicalPage;
}
}
}
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